Proportional pressure reducing valve, pilot-operated, with DC motor actuation DRS

Description

• Size 6
• Component series 1X
• Max. operating pressure 210 bar
• Flow, max. 30 l/min

Features

• Pressure reduction in ports A or P1 with pressure limitation
• For subplate mounting
• Porting pattern according to ISO 4401-03-02-0-05
• Self-locking DC motor → if the supply voltage fails or an error message is sent by the control electronics, the pressure adjustment is maintained
• Position feedback
• Integrated pressure monitoring, optional

Product description

Valves of type DRS are pilot-operated 3-way pressure reducing valves with pressure limitation of the actuator. They are used for reducing a system pressure.

Set-up

The valves consist of three main assemblies:

• Pilot control valve (1)
  • DC motor (2) with position feedback
  • Main valve (3) with main spool (4)
  • Optionally with or without pressure transducer (18)
  • Command value-dependent setting of the pressure to be reduced in channel A via the DC motor (2).
  • In the depressurized port P, the spring (17) holds the main spool (4) in the initial position → Connection from port A to T open, port P to A blocked
  • Pressure connection from port P to the ring channel (5). Pilot oil flows through the bore (6) via the flow controller (7) into the pilot control chamber (16), via the nozzle (8), the throttle gap (9) into chamber (10) and via bores (11; 12) to port T.
  • Build-up of the pilot pressure in the pilot control chamber (16) as a function of the command value.
  • Movement of the main spool (4) to the right → hydraulic fluid flows from P to A.
  • Actuator pressure present in port A to the spring chamber (15) via channel (13) and nozzle (14).
  • Increase in the pressure in port A to the set command pressure leads to the movement of the main spool (4) to the left in its control position. Pressure in port A is almost identical to the set pressure at the pilot control valve (1).
  • If the pressure in port A exceeds the set command pressure, the main spool (4) is moved further to the left.
  • This closes the connection from P to A, opens the connection from P to T and limits the pressure present in port A according to the set command value.

Function

Pressure reduction

Pressure limitation not possible if there is dirt.

Pressure monitoring

With valves with integrated pressure transducers, the transducer is connected to the electronics and is intended for the recording and monitoring of the pressure set in channel A. Another alternative is a valve without integrated pressure transducer but with a sandwich plate for pressure measurement. (For example applications, see data sheet 62003)

Notice:

If the voltage supply of the control electronics is switched off or fails, the DC motor stops at its current position which means that, if the hydraulic supply is available, the most recently set pressure is maintained.

Type DRS 6 -1X/...

Type code

Technical data

general

hydraulic

Notice:

The technical data were determined at a viscosity of 46 mm²/s (HLP46; 40 °C).

electrical

Notice:

The valves may not be used for safety-relevant machine functions since only the electrical area and not the hydraulic area is secured. This means that if the hydraulic pressure in P drops to 0 bar, the actuator pressure (A) or secondary pressure (P➀) is inevitably 0 bar as well.

When establishing the electrical connection, the protective earthing conductor (PE) has to be connected properly.

Diagrams/characteristic curves

(measured with HLP46, ϑOil = 40 ±5 °C)

Type DRS (P → A)

Notice:

The indicated pressure differential value corresponds to the minimum pressure available in port P (P➁) minus the maximum pressure to be controlled in port A (P➀).

Pressure in port P➀ or A dependent on the command value

Pressure rating 50 bar

Pressure rating 100 bar

Pressure rating 210 bar

Minimum set pressure in port P➀ or A with command value 0 V

(without counter pressure in channel T or T➀)

Pressure rating 50 bar

Pressure rating 100 bar / 210 bar

Pressure in port P➀ or A dependent on the flow

Pressure rating 50 bar

Pressure rating 100 bar

Pressure rating 210 bar

Symbols/Circuit diagrams

Version "A" (with pressure transducer)

Version “S” (with pressure transducer)

Electrical connection

Pressure transducer at the device, version “S" (M12 plug-in connection, 4-pole; view to contact side)

Dimensions

Type DRS

Dimensions in mm

Required surface quality of the valve contact surface

Recommended valve mounting screws (separate order):

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9-flZn-240h-L

(Friction coefficient μtotal = 0.09 to 0.14)

Tightening torque MA = 7 Nm ± 10%

Material no. R913000064 (separate order) or

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9

(Friction coefficient μtotal = 0.12 to 0.17)

Tightening torque MA = 8.1 Nm ± 10%

Notice

The tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure.

Subplates (separate order) see data sheet 45052.

Accessories

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1

4P Z24

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1

4P Z24

• For sensors and valves with connector “K24”, “K35” and “K72”
• Mating connectors M12, 4-pole, line cross-section 0.75 mm2

• Data sheet

• Spare parts and repair

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1, with assembled connection line, cable shielded

4P M12 +

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1, with assembled connection line, cable shielded

4P M12 +

• For sensors and valves with connector “K24”, “K35” and “K72”
• Cable sets M12, 4-pole, line cross-section 0.34 mm2

• Data sheet

• Spare parts and repair

Downloads

Proportional pressure reducing valve, pilot operated, with DC motor operation Data Sheet | RE29173 | 2015-10-01 | English | PDF | 592k Product Groups: Pilot operated Type DRS and ZDRS